Some icons in the Application Menu are missed

[Rostislav Krasny]

I've FreeBSD 10.0-BETA2 with xfce-4.10_5 binary packages installed.
Icons of following three items in the Application Menu are missed:

1. Run Program...
2. Setting | Keyboard
3. Multimedia | Audio Mixer

Instead of the right icons there is an icon with red X. Also, when I
run any of those application the icon in the left top corner of the
window is also looks like a default icon of an application without any
custom icon.

Where those icons are usually located? Within the executable files
themselves? There are a few icons in /usr/local/share/pixmaps/
directory. But most of the icons are not there. Then where are they
taken from?